The figure below shows AB and AC
tangent to circle O at B and C. D is a point on circle O and
DA1 = a1, DB1 = b1, and DC1 = c1 are perpendicular to BC, AC, and AB,
respectively. Prove that a1 is the geometric mean of
b1 and c1:

Geometric Art: Circular Patterns of Problem 1020
using iPad Apps.

Geometric Art using Mobile Apps.

Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids. A mobile app or mobile application software is a computer program designed to run on smartphones and tablet computers.